Danny and Linda , not sure on park yet we are still deciding , my 5er is still in for service since day we bought , and they are telling me another 4-6 weeks for parts , very frustrating. Now waiting for owners reply. Got redwood involved why parts take so long. Waits going to happen when we go full time in next couple months ,

Hopefully by then it'll be top notch for you. If not get approval for mobil techs or become real handy.
We've stayed at Oasis, Ft Amarillo, Amarillo RV Ranch, never stayed at the KOA. The Oasis is probably the nicest, but nothing out there to block the wind. RV Ranch was ok, but not in the best part of town. Ft Amarillo is our favorite,, smaller, great indoor pool, closer to shopping & DW really likes the gift shop/store.

I agree with Paul But I think 12 minutes might be a little long depending on the pressure of the system. What you might want to do is Turn on the flush and time how long it takes for the full light starts blinking on the black tank level system. Mine usually runs 6-7 minutes and the light is flashing. like I said pressure and water flow will change the time to fill the tank. I have done the bad thing and had it flowing across the roof. Not a good feeling.

I don't even pay attention to my sensors, not sure they would ever read full, of the 3 hold tank sensors on mine they've read 1/3 to 2/3 since the day I towed it off the lot.

Ken -

Why not use a Inline water meter?

Tells exactly the water throughput along with a simple phone stopwatch app gives you flow/minute. Essential for calibrating the iSeries TSM.

That's what I use to determine water flow after setting PSI pressure gauge to about 50PSI, all things being equal.

Also helps with back flushing grey & black tanks so I know how much time until they are really full.